Purenex 1C-1GAC-1S-1I-1M50 Reverse Osmosis RO Filter Replacement Set with 50 GPD Membrane 1. Sediment Filter 5 micron 2.5" x 9.75" 1. Carbon Block Filter 2.5" x 9.75" 1. GAC Coconut Shell Filter 2.5" x 9.75 1. 50GPD Membrane 1. Post Carbon Inline Filter 2" x 10" 1/4" FPNT